cannot locate operating system

  1.    31 Dec 2015 #1

    cannot locate operating system

    My dell 7500 has windows 7(C: drive) and windows 10(F: drive) installed on the single internal HDD. It also has three USB disks used only for data. When I boot I get a message saying that an operating system cannot be found and I should try unplugging my USB drives and then reboot. When I unplug the USB drives and re boot, it finds the windows systems and finishes the boot process with no trouble.
    Checking the BIOS shows only the CD-Rom drive and the three USB drives are listed in the boot order and the drive listing. I then deactivated the "boot from USB drives" item in my BIOS and then the computer boots fine.
    Also, I have been experimenting with Ubuntu on a USB pen drive but have removed it. I suspect that there are some parts of grub hanging around.

    Why can't the bios find my internal HDD which contains the two Windows systems?
      My ComputerSystem Spec

  2.    31 Dec 2015 #2

    You have to get your BIOS boot sequence right. CD ROM as first and then the HDD from which you want to boot. Make sure it contains the bootmgr.
      My ComputerSystem Spec


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